Steam-superheater.



J. H. STIRLING. STEAM SUPERHEATER. APPLICATION TILED JUNE 10, 1913.

Fatented 3%112, 191.5.

5 SHEETS-SHEET 1.

WITNESSES: w?

J. H. STIRLING. STEAM SUPEBHEATER, \AIILIUATION 11.21) JUNE 10, 1913.

1 9 fl 233%23 l 55 o Patented Mar. 2, 1915.

5 SEEBTsSHBET 2.

J. H. TlRLING. STEAM SUPERHEATER. APPLIOATION FILED JUNE 10,1913.

5 SHEETS-SHEET 3,

v Patented Mar. 2, 1915.

Wf M73474,

WITNESSES J. H,. dTIRLING STEAM SUPERHEATER.

APPLICATION FILED JUNE 10 1913.

fate-med Man 2, 1915.

5 SHEETS-SHEET 5.

QM 8 mu M "NH N E R T. S m Z M 1.? M p m x WITNESSES:

. were; Ems-em.

ids

rrnnged sink;

1m smoke box and Holes 100 S U T. 2 e v l H M. 6 FT... 6% r h AM a 1 6 w h n 1 w 9 0 H 16 1.. D. 1 I x O h ib Q: n DU 4C a LL to the greates i .m :5 in ma mnnisizm' .I 15 b n this tie pint-e,

meseis it is below the level of the chambers a and.

b, does its own part in thus protecting the nuts and bolts. If desired, spring Washers may be placed upon the bolts j, between the tie plates and the under surface of the header. v

While I prefer to use the arrangement of elemp plates and spherically ended bolts described I may, it 1 prefer, omit the clamp plates as separate de ice and shape the bolt ends so fiS'lZO engage directly the ends of the tie plates.

l Vhile the nets of the bolts 5 in the errangeinent above described are veryacces sible, access to them may be made even more easy by providing a manhole or door in the smoke box immediately above the nuts as is Well known in the art.

The pipes carrying superheated steam to the steam chest, being at the ends 01 the header beyond all of the supcrheater clements, cannot interfere in any Way With the insertion or removal of any of said elements nor themselves be interfered with.

By suitably modifying the form of the steam chamber the superheater elements may be connected thereto with their inlet ends behind the bolt ends or vice versa, instead of such ends being side by side, same form of bolt connections being employed.

Referring to the modification of my in vention shown in 8 to 10 the nlten noted saturated and superheated steam chambers a and i) are sepa rated from one an other by intermediate vertically disposed air spaces p instead of being integrally united es in the structure of Figs. l7. in these spaces 3) are placed the bolts 7" for attaching the superheeter elements d to the header. In this form the bolts may be completely removed from the header by merely slackening their nuts and drawing them forward,

out of the spaces 79, one after the other.

The bolts y" lying between the chambers a and if instead of being passed through the centers thereof, as in the structure of Figs. 1-7, a single bolt iney be employed to hold a. single su1 )erheater element in position. the two element ends being; expanded into the ends of a single tie plate 2" and the bolt then being, pushed up through the center of T lening or loosening a given bolt, thereto 0, ,no longer effects two superheater elements but only the one ele ment to the tie plate of which the bolt belongs. An advantage possessed by this modification over the form shown in Figs. 1-7 and'prcviously described is that the chambers a and i) are free to expand and contract independently. As their teinpei.-a tures, due to saturate and superheated steam respectively, tei be substantially different it Willreadil son that, strains in the header casting me necessarily set up super-healer is in use it the chainbers are Jl'fll together as in Figs. il-7 where as, where they are spaced from one another,

' S l these strains should be almost cnti y absent. 7 A. further :ulniniagc of the construction embodied in i 840 is that substantielly all loss oi? heat from superheated eh: nbers cto saturated chambers 15 is avoided by reason oi .the intervening air spaces n, Whereas in a construction such as shown. in Figs. 14, Where the saturated and superhczited chambers have a metallic Wall common. to both, the heat loss may be very considerable.

Various chenges may be made in the con-- structions actually shown and dcscrib-Jl without going outside the spirit of my inrention. Thus the saturated channel which extends across the smoke box behind the s i'zharnbers may, instead of being substantiully uniform in cross section, diminish in section toward the ends of the header 21s the number ol chambers remaining to he led with. steam hccmncs llhese channels also need not be directly one above the other, but may be r t forwardly with reference one anothci should it be convenient.

its previously stat d i pr er to arrange tire header in the no part oi. the smoke box, but occasions may arise Where some other location would be more suitable and such locations 1' I be chosen Within the limits of my invei' Lion. Or it might preferred to employ two headers arranged laterally ol' the sniohe bow; on opposite sides thereof; this arrangement also lies Within the spirit of the claims.

Haring dc. ';cribr-.(;l my invention, l clai1n:-

1. in a smoke box su iierhcater of the class described, in combination with the boiler, a header (JOlIlpl'lSlllg a plurality oi? lOlW-Yll'tll) extending chambers arranszd side by side across the smoke box super-heater elements, the ends of which are atta rhcd from be ow when l saturated and superh ed steal n said chambers and if. tube plate and tending ac s the smoke box, said chambers openingalterl'iately into said channel 2. n n. sniolre he superhe tor of? described. in combination with the boihi, e. header (fOlfll'lllSlllg a, plurality of torwardl extending chambers arranged side by across the enrol-1e box superheater elements, the ends of which are attached lirorn below to said chambers, and pairo'l channels .torseturnted and superheated steam arranged one shove the c betwee said chambei and th tube plate. id chambers opening alternetcly into 9 a smoke ile aim. in

elow

dis 

